Nizatidine is a medication that belongs to a class of drugs known as H2 blockers. It works by reducing the amount of acid produced in the stomach, which helps treat conditions like gastroesophageal reflux disease (GERD) and peptic ulcers. By decreasing stomach acid, it can alleviate symptoms such as heartburn and indigestion. This medication is typically taken orally in the form of capsules or liquid. Common side effects may include headache, dizziness, or gastrointestinal issues. It is important to follow a healthcare provider's instructions when using nizatidine to ensure safe and effective treatment.